Compile error when using async traits

[SeanCheatham]

Thanks a bunch for continuing the work on the uniffi KMP bindings. I've had some pretty solid success using your updates in a project that needed Kotlin 2 support.

While most things seem to work well so far, I noticed there are some issues when using async/future calls. In my particular use-case, I am attempting to define a foreign async trait like:

#[uniffi::export(with_foreign)]
#[async_trait::async_trait]
pub trait DataWriter: Send + Sync {
    async fn write(&self, data: Vec<u8>);
}

#[uniffi::export]
pub async fn foo(writer: &dyn DataWriter) -> () {
    writer.write(vec![1, 2, 3]).await;
}

After running through the bindgen, the resulting Kotlin code does not successfully compile. I took a quick look at the corresponding Async templates and it looks like it may only be partially implemented.

I'm curious if you've had a chance to use the async functionality in any of your projects, or if you might already have plans to update the async bindgen implementations? I tried to play around with it on my own but I'm not very familiar with the internals.

Thanks again!

[lebedenko-ubique]

Hello there, sorry for the late reply and thanks for the kind words! We are aware of this issue, but it is currently not on top of our priority list. But if I have time I will have a look at it.